But the real question moguls will ask themselves: Is Donald Trump listening?

In our jokey times, it is perhaps fitting that the entire media and technology sector had been waiting on the outcome of a Justice Department antitrust suit that never should have been brought in the first place. We refer, naturally, to the department’s lawsuit opposing the merger of AT&T and Time Warner, which Judge Richard Leon so handily rejected in his much-awaited decision Tuesday in favor of the two companies.

Indeed, the case probably would not have been brought if Donald Trump had not spontaneously and inappropriately...